The earth’s atmosphere has a lot of things that are perfect for us – perfect temperature, perfect gas concentrations, perfect humidity, perfect food sources ….. another Earth is a tall order. At the moment an average European is living as if we had 3 earths while the average north American lives as if we had 5 earths. So, there is still a lot of work to do on this earth before we abandon for other planets …… 🙂
Living as we know it today exists and balances because of what we know about Earth, its environment and also its atmosphere … However, scientists are still looking for alternatives and who knows there could be one!! There are talks about the Earth getting crowded but the thing is it is not we are only talking about habitable locations … I would think why not make the inhabitable habitable and try to make the best of it 😉
Personally, I am not ready yet to leave Earth although I wouldn’t mind a holiday in Mars or any other planet 😉
the planet would have to be close enough for us to reach it in a relatively short period of time and be sufficiently like Earth so we could exist on it with lots of protection. Mars might fill the bill but it would need us to be in a very desperate situation on Earth to make it worthwhile trying. It would be far easier to remain on Earth and try to fix things here or, better, not mess things up in the first place as we seem to be doing at the moment.